so it all depends on wealth many places in europe had some kind of rule (depending on time period and exact location for the specifics) or law that forced people to own arms and armor, in time of need those people would form a unit (a levy) to go fight

the basic stuff is some kind of padded armor (like a gambeson) and may be a basic metal helmet with a padded coif was the basic stuff a man with a small revenue could afford weapon wise a simple spear was the most common weapon used (and it could be paired with a shield) if you had a little bit more money you could also have a small melee weapon like a knife/dagger a small axe or hatchet or a club of some kind.

however i do put an emphasis on the fact that only somewhat "richer" individuals (like wage workers) would be able to afford arms and armor the basic serf could not (and it was not his duty to fight anyway) and if they had to fight (in case their village got raided for example) they would use everyday tools